Tcp Transmission Control Protocol Tau-Books Pdf

TCP Transmission Control Protocol TAU
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Create a New Project, 1 Start Riverbed Modeler Academic Edition Choose New from the File menu. 2 Select Project and click OK Name the project your initials TCP and the. scenario No Drop Click OK, 3 In the Startup Wizard Initial Topology dialog box make sure that Create Empty. Scenario is selected Click Next Select Choose From Maps from the. Network Scale list Click Next Choose USA from the Map List Click Next. twice Click Finish,Create and Configure the Network. Initialize the Network, 1 The Object Palette dialog box should now be on the top of your project space If it. is not there open it by clicking Make sure that the internet toolbox item is. selected from the pull down menu on the object palette. The ip32 cloud node 2 Add to the project workspace the following objects from the palette Application. model represents an IP Config Profile Config an ip32 Cloud and two subnets. cloud supporting up to,32 serial line interfaces at.
a selectable data rate a To add an object from a palette click its icon in the object palette Move your. through which IP traffic mouse to the workspace Click to drop the object in the desired location. can be modeled IP, packets arriving on any Right click to finish creating objects of that type. cloud interface are,routed to the appropriate 3 Close the palette. output interface based,on their destination IP, address The RIP or 4 Rename the objects you added as shown and then save your project. OSPF protocol may be,used to automatically,and dynamically create. the cloud s routing tables,and select routes in an.
adaptive manner This,cloud requires a fixed,amount of time to route. each packet as,determined by the,Packet Latency,attribute of the node. Configure the Applications, 1 Right click on the Applications node Edit Attributes Expand the. Application Definitions attribute and set rows to 1 Expand the new row. Name the row FTP Application, i Expand the Description hierarchy Edit the Ftp row as shown there are. 7 zeros in that number,2 Click OK twice and then save your project.
Configure the Profiles, 1 Right click on the Profiles node Edit Attributes Expand the Profile. Configuration attribute and set rows to 1,i Name and set the attributes as shown Click OK. Configure the West Subnet, 1 Double click on the West subnet node You get an empty workspace indicating. that the subnet contains no objects, 2 Open the object palette and make sure that the internet toolbox item is. selected from the pull down menu, The ethernet4 slip8 3 Add the following items to the subnet workspace one ethernet server one.
gtwy node model ethernet4 slip8 gtwy router and connect them with a bidirectional 100 BaseT. represents an IP based, gateway supporting four link Close the palette Rename the objects as shown. Ethernet hub interfaces,and eight serial line,interfaces. 4 Right click on the Server West node Edit Attributes. i Edit Application Supported Services inside Applications Set rows. to 1 Set Name to FTP Application Click OK, ii Edit the value of the Server Address attribute and write down Server West. iii Expand the TCP Parameters hierarchy inside TCP Set Flavor to. 5 Click OK and then save your project, Now you have completed the configuration of the West subnet To go back to the top. level of the project click the Go to next higher level button. Configure the East Subnet, 1 Double click on the East subnet node You get an empty workspace indicating.
that the subnet contains no objects, 2 Open the object palette and make sure that the internet toolbox item is. selected from the pull down menu, 3 Add the following items to the subnet workspace one ethernet wkstn one. ethernet4 slip8 gtwy router and connect them with a bidirectional 100 BaseT. link Close the palette Rename the objects as shown. 4 Right click on the Client East node Edit Attributes. i Expand the Application Supported Profiles hierarchy in Application. Set rows to 1 Set Profile Name to FTP Profile, ii Edit the Application Destination Preferences attribute as follows. Set rows to 1 Set Symbolic Name to FTP Server Edit Actual Name. Set rows to 1 In the new row assign Server West to the Name column. iii Assign Client East to the Client Address attributes. 5 Click OK and then save your project, 6 You have now completed the configuration of the East subnet To go back to the. project space click the Go to next higher level button. Connect the Subnets to the IP Cloud,1 Open the object palette.
2 Using two PPP DS3 bidirectional links connect the East subnet to the IP Cloud. and the West subnet to the IP Cloud, 3 A pop up dialog box will appear asking you what to connect the subnet to the IP. Cloud with Make sure to select the routers,4 Close the palette. Choose the Statistics, 1 Right click on Server West in the West subnet and select Choose Individual. Statistics from the pop up menu, 2 In the Choose Results dialog box choose the following statistic. TCP Connection Congestion Window Size bytes and Sent Segment. Sequence Number,Modeler provides the,following capture.
modes 3 Right click on the Congestion Window Size bytes statistic Choose Change. Collection Mode In the dialog box check Advanced From the drop down. All values collects menu assign all values to Capture mode as shown Click OK. every data point from a,Sample collects the,data according to a user. specified time interval or,sample count For,example if the time. interval is 10 data is,sampled and recorded,every 10th second If the. sample count is 10 every,10th data point is,recorded All other data. points are discarded,Bucket collects all of,the points over the time.
interval or sample count,into a data bucket and,generates a result from. each bucket This is the 4 Right click on the Sent Segment Sequence Number statistic Choose. default mode Change Collection Mode In the dialog box check Advanced From the. drop down menu assign all values to Capture mode,5 Click OK twice and then save your project. 6 Click the Go to next higher level button,Configure the Simulation. Here we need to configure the duration of the simulation. 1 Click on and the Configure Simulation window should appear. 2 Set the duration to be 10 0 minutes,3 Click Run and then save your project. Duplicate the Scenario, In the network we just created we assumed a perfect network with no discarded packets.
Also we disabled the fast retransmit and fast recovery techniques in TCP To analyze the. effects of discarded packets and those congestion control techniques we will create two. additional scenarios, 1 Select Duplicate Scenario from the Scenarios menu and give it the name. With fast retransmit,TCP performs a Drop NoFast Click OK. retransmission of what, appears to be the 2 In the new scenario right click on the IP Cloud Edit Attributes Assign. missing segment 0 5 to the Packet Discard Ratio attribute in the Performance Metrics. without waiting for a, retransmission timer to 3 Click OK and then Run a simulation and then save your project. After fast retransmit 4 While you are still in the Drop NoFast scenario select Duplicate Scenario from. sends what appears to be the Scenarios menu and give it the name Drop Fast. the missing segment,congestion avoidance, but not slow start is 5 In the Drop Fast scenario right click on Server West which is inside the West.
performed This is the subnet Edit Attributes Expand the TCP Parameters hierarchy inside. fast recovery algorithm,TCP Set Flavor to Reno,The fast retransmit and. fast recovery algorithms, are usually implemented 6 Click OK and then Run a simulation and then save your project. together RFC 2001,View the Results,To view and analyze the results. To switch to a scenario 1 Switch to the Drop NoFast scenario the second one and choose View Results. choose Switch to, Scenario from the from the Results in the DES menu. Scenarios menu or just,press Ctrl scenario, 2 Fully expand the Object Statistics hierarchy and select the following two results.
number Congestion Window Size bytes and Sent Segment Sequence Number. 3 Click Show The resulting graphs should resemble the ones below. 4 To zoom in on the details in the graph click and drag your mouse to draw a. rectangle as shown above, 5 The graph should be redrawn to resemble the following one. 6 Notice the Segment Sequence Number is almost flat with every drop in the. congestion window, 7 Close the View Results dialog box and select Compare Results from the Result. 8 Fully expand the Object Statistics hierarchy as shown and select the following. result Sent Segment Sequence Number, 9 Click Show After zooming in the resulting graph should resemble the one below. Further Readings, Transmission Control Protocol IETF RFC number 793 www ietf org rfc html. 1 Why does the Segment Sequence Number remain unchanged indicated by a. horizontal line in the graphs with every drop in the congestion window. 2 Analyze the graph that compares the Segment Sequence numbers of the three. scenarios Why does the Drop NoFast scenario have the slowest growth in. sequence numbers, 3 In the Drop NoFast scenario obtain the overlaid graph that compares Sent.
Segment Sequence Number with Received Segment ACK Number for. Server West Explain the graph, Make sure to assign all values to the Capture mode of the Received. Segment ACK Number statistic, 4 Create another scenario as a duplicate of the Drop Fast scenario Name the. new scenario Q4 Drop Fast Buffer In the new scenario edit the attributes of. the Client East node and assign 65535 to its Receiver Buffer bytes attribute. one of the TCP Parameters Generate a graph that shows how the Congestion. Window Size bytes of Server West gets affected by the increase in the receiver. buffer compare the congestion window size graph from the Drop Fast scenario. with the corresponding graph from the Q4 Drop Fast Buffer scenario. Lab Report, Prepare a report that follows the guidelines explained in Lab 0 The report should include. the answers to the above questions as well as the graphs you generated from the. simulation scenarios Discuss the results you obtained and compare these results with your. expectations Mention any anomalies or unexplained behaviors. Laboratory8 TCP Transmission Control Protocol A Reliable Connection Oriented Byte Stream Service Objective This lab is designed to demonstrate the congestion

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